JavaScript
Articles
Resources

Web Dev frameworks

    Next.js - Framework for server-rendered or statically-exported React apps.
    San - Flexible JavaScript component framework.
    hapi - Rich framework for building applications and services.
    Koa - Smaller, more expressive, and more robust foundation for web applications and APIs.
    Umi - Pluggable enterprise-level react application framework.
    Vue.js - Progressive JavaScript Framework.
    Mithril - Modern client-side Javascript framework for building Single Page Applications. (HN)
    Solid - Declarative, efficient, and flexible JavaScript library for building user interfaces.
    Neutrino dev
    Alpine.js - Rugged, minimal framework for composing JavaScript behavior in your markup. (Awesome Alpine)
    After.js - Next.js-like framework for server-rendered React apps built with React Router 4.
    Torus - Event-driven model-view UI framework for the web, focused on being tiny, efficient, and free of dependencies. (Web)
    Hyperapp - Tiny framework for building web interfaces. (Web) (HN) (Hyperawesome)
    Hyperapp FX - Effects for use with Hyperapp.
    Phenomic - Modular website compiler (React, Webpack, Reason and whatever you want).
    Halfmoon - Front-end framework with a built-in dark mode and full customizability using CSS variables; great for building dashboards and tools. (Docs)
    Sinuous - Low-level UI library with a tiny footprint. (Docs)
    Overture - Powerful JS library for building really slick web applications, with performance at, or surpassing, native apps.
    Lucia - Tiny library for tiny web apps. (Docs)
    Ractive.js - Next-generation DOM manipulation.
    JSX Lite - Write components once, run everywhere. Compiles to Vue, React, Solid, Liquid, and more.
    Perlite - Hyperactiv + lit-html + extensions. Simple and declarative way to create rich client-side widgets designed with server-side apps in mind.
    Democrat - Library that mimic the API of React (Components, hooks, Context...) but instead of producing DOM mutation it produces a state tree.
    Raj - Elm Architecture for JavaScript.
    Reframe - New kind of web framework.
    observablehq/stdlib - Observable standard library.
    Choo - Sturdy 4kb frontend framework. (Web)
    Typera - Type-safe routes for Express and Koa.
    Frourio - Fast and type-safe full stack framework, for TypeScript. (Web)
    Svelto - Modular front end framework for modern browsers, with battery included: 100+ widgets and tools.
    modular - Collection of tools and guidance to enable UI development at scale. (Tweet)
    Turbo - Speed of a single-page web application without having to write any JavaScript. (Web)
    Fre - Tiny Coroutine framework with Fiber.
    Glimmer - Fast and light-weight UI components for the web. (Code)
    Glimmer VM - Flexible, low-level rendering pipeline for building a "live" DOM from Handlebars templates that can subsequently be updated cheaply when data changes.
    frint - Modular JavaScript framework for building scalable and reactive applications.
    Nano Router - Framework agnostic minimalistic router with a focus on named routes.
    tiny-request-router - Fast, generic and type safe router (match request method and path).
    Synergy - Tiny runtime library for building web user interfaces. (HN)
    dflex - JavaScript Project to Manipulate DOM Elements.
    morphdom - Fast and lightweight DOM diffing/patching (no virtual DOM needed).
    Forgo - Ultra-light UI runtime. Makes it super easy to create modern web apps using JSX (like React).
    Whats Up - Front-end framework based on ideas of streams and fractals.
    Boost - Collection of type-safe cross-platform packages for building robust server-side and client-side systems.
    Nostalgie - Opinionated, full-stack, runtime-agnostic framework for building web apps and web pages using react. (Web)
    Lumino - Library for building interactive web applications.

Animation

    Anime.js - JavaScript animation engine.
    popmotion - Functional, reactive animation library.
    impress.js - Presentation framework based on the power of CSS3 transforms and transitions.
    Pts - Library for visualization and creative-coding.
    lax.js - Simple & light weight (<2kb gzipped) vanilla JS plugin to create smooth & beautiful animations when you scroll.
    Flipping - Library (and collection of adapters) for implementing FLIP transitions.
    Ola - Smooth animation library for interpolating numbers.
    react-spring - Spring physics based React animation library.
    FAT - Web's fastest and most lightweight animation tool.
    React Easy Flip - Lightweight React library for smooth FLIP animations.
    AOS - Animate on scroll library.
    flubber - Tools for smoother shape animations.

CLI

    qoa - Minimal interactive command-line prompts.

Test

    Unexpected - Extensible BDD assertion toolkit. (Docs)
    Fishery - Library for setting up JavaScript objects as test data.
    pentf - Parallel end-to-end test framework.
    test-flat - Test framework extension to support resources teardown and cleanup in flat tests.
    zora - Lightest, yet Fastest JavaScript test runner for nodejs and browsers.
    Vest - Declarative Validation Testing.

State management

    Mutik - Tiny (495B) immutable state management library based on Immer.
    Overmind - Frictionless state management. (Docs) (HN)
    Storeon - Tiny event-based Redux-like state manager for React and Preact.
    Overstated - React state management library that's delightful to use, without sacrificing performance or scalability.
    Effector - Reactive state manager. (Awesome) (Docs) (effector-storage)
    Akita - State Management Tailored-Made for JS Applications.
    Observable Store - Provides a simple way to manage state in Angular, React, Vue.js and other front-end applications.
    Cerebral - Declarative state and side effects management solution for popular JavaScript frameworks.
    Hooksy - State management solution based on react hooks.
    React Easy State - Simple React state management. Made with ❤️ and ES6 Proxies.
    wana - Easy observable state for React.
    Recoil - Experimental set of utilities for state management with React. (Web) (Video) (Reddit) (Rewriting from scratch) (Recoilize - Recoil developer tool)
    State Designer - JavaScript and TypeScript library for managing the state of a user interface.
    Fluxible - Pluggable container for universal flux applications.
    Logux State - Tiny state manager with CRDT, cross-tab, and Logux support.
    Statery - Surprise-Free State Management. Designed for React with functional components.

API bindings

DB

    sql.js - SQLite compiled to JavaScript. Allows you to create a relational database and query it entirely in the browser. (Docs) (HN)
    SQigiL - Postgres SQL template string for Javascript.
    Postgrest JS - Isomorphic JavaScript client for PostgREST.
    Connect PG Simple - Simple, minimal PostgreSQL session store for Express/Connect.

React

Other

    micro github - Tiny microservice that makes adding authentication with GitHub to your application easy.
    pico.js - Face detection library in 200 lines of JavaScript.
    mdxc - Use React Components within Markdown.
    ReLaXeD - Create PDF documents using web technologies. (Examples)
    Dragula - Drag and drop so simple it hurts.
    Hammer.js - Multi-touch gestures.
    emittery - Simple and modern async event emitter.
    Xstate - State machines and statecharts for the modern web. (State Machines Workshop)
    xstate-component-tree - Build a tree of UI components based on your state chart.
    virtual-scroller - Maps a provided set of JavaScript objects onto DOM nodes, and renders only the DOM nodes that are currently visible, leaving the rest "virtualized".
    jSPDF - Client-side JavaScript PDF generation for everyone.
    ForgJS - JavaScript lightweight object validator.
    faker.js - Generate massive amounts of realistic fake data in Node.js and the browser.
    arg - Simple argument parsing.
    fbt - JavaScript Internationalization Framework.
    fuzzysearch - Tiny and blazing-fast fuzzy search in JavaScript.
    normalizr - Normalizes nested JSON according to a schema.
    FBJS - Collection of utility libraries used by other Facebook JS projects.
    Uppy - Next open source file uploader for web browsers. (Web)
    ScrollReveal - Animate elements as they scroll into view.
    Shiny - Add shiny reflections to text, backgrounds, and borders on devices that support the DeviceMotion event.
    Hotkey Behavior - Trigger a action on element when keyboard hotkey is pressed.
    Bili - Makes it easier to bundle JavaScript libraries.
    Memoizee - Complete memoize/cache solution for JavaScript.
    Immer - Create the next immutable state by mutating the current one.
    FlexSearch - Web's fastest and most memory-flexible full-text search library with zero dependencies.
    cofx - Node and javascript library that helps developers describe side-effects as data in a declarative, flexible API.
    Mercury Parser - Extracts the bits that humans care about from any URL you give it.
    Refract - Harness the power of reactive programming to supercharge your components.
    MemJS - Memcache client for node using the binary protocol and SASL authentication.
    memfs - In-memory filesystem with Node's API.
    Accounts - Fullstack authentication and accounts-management for GraphQL and REST.
    Cleave.js - Format input text content when you are typing...
    Unistore - Tiny 350b centralized state container with component bindings for Preact & React.
    Ramda - Practical functional library for JavaScript programmers.
    fromfrom - JS library written in TS to transform sequences of data from format to another.
    Editor.js - Block-styled editor with clean JSON output.
    ijk - Transforms arrays into virtual DOM trees.
    Cleave.js - Format input text content when you are typing.
    Oboe.js - Streaming approach to JSON. Oboe.js speeds up web applications by providing parsed objects before the response completes.
    Choices.js - Vanilla JS customisable select box/text input plugin.
    Shepherd - Guide your users through a tour of your app.
    object-cull - Create a copy of an object with just the bits you actually need.
    Sigma - JavaScript library dedicated to graph drawing.
    interact.js - JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers.
    flru - Tiny (215B) and fast Least Recently Used (LRU) cache.
    Yup - Dead simple Object schema validation.
    Lerna - Tool for managing JavaScript projects with multiple packages.
    WikiJs - Wikipedia Interface for Node.js.
    virtual-audio-graph - Library for declaratively manipulating the Web Audio API.
    deep-object-diff - Deep diffs two objects, including nested structures of arrays and objects, and returns the difference.
    Snarkdown - Snarky 1kb Markdown parser written in JavaScript.
    Terser - JavaScript parser, mangler, optimizer and beautifier toolkit for ES6+.
    AppAuthJS - JavaScript client SDK for communicating with OAuth 2.0 and OpenID Connect providers.
    expr-eval - Mathematical expression evaluator in JavaScript.
    robust-predicates - Fast robust predicates for computational geometry in JavaScript.
    Sanctuary - JavaScript functional programming library inspired by Haskell and PureScript.
    modali - Delightful modal dialog component for React, built from the ground up to support React Hooks.
    Tweakpane - Compact GUI for fine-tuning parameters and monitoring value changes.
    crocks - Collection of well known Algebraic Data Types for your utter enjoyment.
    Just - Library of zero-dependency npm modules that do just do one thing.
    nanoid - Tiny (139 bytes), secure, URL-friendly, unique string ID generator for JavaScript.
    debug - Tiny JavaScript debugging utility modelled after Node.js core's debugging technique. Works in Node.js and web browsers.
    roughViz.js - Reusable JavaScript library for creating sketchy/hand-drawn styled charts in the browser.
    Mitt - Tiny 200 byte functional event emitter / pubsub.
    RequireJS - File and module loader for JavaScript.
    Zero - 3D graphics rendering pipeline. Implemented in JavaScript. Run in a terminal.
    xstate-viz - Visualize state charts.
    htmr - Simple and lightweight (< 2kB) HTML string to React element conversion library.
    react-jsx-parser - React component which can parse JSX and output rendered React Components.
    Static Land - Specification for common algebraic structures in JavaScript based on Fantasy Land.
    sorted-queue - Sorted queue, based on an array-backed binary heap.
    polendina - Non-UI browser testing for JavaScript libraries from the command-line.
    agadoo - Check whether a package is tree-shakeable.
    Fielder - React form library which adapts to change.
    lemonad - Functional programming library for JavaScript. An experiment in elegant JS.
    Mockttp - Lets you quickly & reliably test HTTP requests & responses in JavaScript, in both Node and browsers.
    Flowy - Minimal javascript library to create flowcharts.
    d3-dag - Layout algorithms for visualizing directed acyclic graphs.
    renature - Physics-based animation library for React focused on modeling natural world forces.
    Morphism - Do not repeat anymore your objects transformations.
    Tonic - Stable, Minimal, Auditable, Build-Tool-Free, Low Profile Component Framework.
    Quiet.js - Transmit data with sound using Web Audio -- Javascript binding for libquiet.
    Bindery - Library for designing printable books with HTML and CSS.
    Wretch - Tiny wrapper built around fetch with an intuitive syntax.
    Virt.js - Free collection of useful standard devices, that can be used to power various engine that makes use of the exposed interfaces.
    Path-to-RegExp - Turn a path string such as /user/:name into a regular expression.
    Bacon.js - Functional reactive programming library for TypeScript and JavaScript.
    GGEditor - Visual graph editor based on G6 and React.
    Arbor - Graph visualization library using web workers and jQuery. (Web)
    fsm-as-promised - Finite state machine library using ES6 promises.
    x-spreadsheet - Web-based JavaScript(canvas)spreadsheet.
    IsoCity - Isometric city builder in JavaScript.
    car - Simple 2d car physics with JavaScript. (HN)
    Picomatch - Blazing fast and accurate glob matcher written in JavaScript.
    react-isomorphic-data - Easily fetch data in your React components, with similar APIs to react-apollo.
    klona - Tiny (228B) and fast utility to "deep clone" Objects, Arrays, Dates, RegExps, and more.
    ScrollMagic - JavaScript library for magical scroll interactions.
    GoJS - JavaScript and TypeScript library for building interactive diagrams and graphs.
    Rete - JavaScript framework for visual programming and creating node editor. (HN)
    Pre3d - JavaScript 3d rendering engine.
    dancer.js - High-level audio API, designed to make sweet visualizations.
    model-viewer - Easily display interactive 3D models on the web and in AR.
    Spars - General toolkit for creating interactive web experiences.
    NeuroJS - JavaScript deep learning and reinforcement learning library.
    Hareactive - Purely functional reactive programming library.
    Mirage JS - Client-side server to develop, test and prototype your JavaScript app.
    dfa - State machine compiler with regular expression style syntax.
    Jtree - Tree Notation TypeScript/Javascript library.
    Hydra - Livecoding networked visuals in the browser.
    p-queue - Promise queue with concurrency control.
    gsheets - Get public Google Sheets as plain JavaScript/JSON.
    alga-ts - Algebraic graphs implementation in TypeScript.
    Chart.js - Simple HTML5 Charts using the tag. (Awesome)
    on-change - Watch an object or array for changes.
    clean-set - Deep assignment alternative to the object spread operator and Object.assign.
    Uppload - Better JavaScript image uploader with 30+ plugins.
    pino - Super fast, all natural JSON logger.
    Orbit - Composable data framework for ambitious web applications.
    panzoom - Universal pan and zoom library (DOM, SVG, Custom).
    intl-tel-input - JavaScript plugin for entering and validating international telephone numbers.
    three.js - JavaScript 3D library.
    shortid - Short id generator. Url-friendly. Non-predictable. Cluster-compatible.
    styx - Derives a control flow graph from a JavaScript AST.
    Crossfilter - JavaScript library for exploring large multivariate datasets in the browser.
    SiriWave - Apple Siri wave-form replicated in a JS library.
    Shades - Lodash-inspired lens-like library for Javascript.
    mxGraph - Fully client side JavaScript diagramming library.
    cacache - Node.js library for managing local key and content address caches.
    enhanced-resolve - Offers an async require.resolve function. It's highly configurable.
    notevil - Evalulate javascript like the built-in javascript eval() method but safely.
    react-digraph - Library for creating directed graph editors.
    bent - Functional JS HTTP client (Node.js & Fetch) w/ async await.
    CLUI - Collection of JavaScript libraries for building command-line interfaces with context-aware autocomplete.
    cosha - Colorful shadows for your images.
    Rambda - Faster and smaller alternative to Ramda.
    MathJax - Open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers. (Web) (HN)
    Litepicker - Date range picker - lightweight, no dependencies.
    core-js - Modular standard library for JavaScript.
    timeago.js - Nano library (less than 2 kb) used to format datetime with *** time ago statement. eg: '3 hours ago'.
    Serialize JavaScript - Serialize JavaScript to a superset of JSON that includes regular expressions, dates and functions.
    Tippy.js - Tooltip, popover, dropdown, and menu library.
    howler.js - JavaScript audio library for the modern web.
    date-fns - Modern JavaScript date utility library.
    Midi - Convert MIDI into Tone.js-friendly JSON.
    face-api.js - JavaScript API for face detection and face recognition in the browser and nodejs with tensorflow.js.
    Spotlight - Search widget for your web API.
    Fuse - Lightweight fuzzy-search, in JavaScript.
    Xterm.js - Terminal for the web.
    Change Case - Convert strings between camelCase, PascalCase, Capital Case, snake_case and more.
    ChronoGraph - Reactive, graph-based, computation engine.
    Sprotty - Diagramming framework for the web.
    prerender.js - Loads pages quickly on any browser.
    on-finished - Execute a callback when a request closes, finishes, or errors.
    ColorFns - Modern JavaScript color utilities library.
    grapheme-splitter - JavaScript library that breaks strings into their individual user-perceived characters.
    Web Animations - JavaScript implementation of the Web Animations API.
    p-limit - Run multiple promise-returning & async functions with limited concurrency.
    Highcharts JS - JavaScript charting library based on SVG.
    μPlot - Small, fast chart for time series, lines, areas, ohlc & bars.
    Baobab - JavaScript & TypeScript persistent and optionally immutable data tree with cursors.
    emoji-regex - Regular expression to match all Emoji-only symbols as per the Unicode Standard.
    MerkleTree.js - Construct Merkle Trees and verify proofs in JavaScript.
    Snabbdom - Virtual DOM library with focus on simplicity, modularity, powerful features and performance.
    Thwack - Tiny modern data fetching solution.
    Regenerate - Generate JavaScript-compatible regular expressions based on a given set of Unicode symbols or code points.
    Crank.js - Write JSX-driven components with functions, promises and generators. (Article) (Reddit) (HN)
    redaxios - Axios API, as an 800 byte Fetch wrapper.
    Math.js - Extensive math library for JavaScript and Node.js.
    pixelmatch - Smallest, simplest and fastest JavaScript pixel-level image comparison library.
    quilt - Loosely related set of packages for JavaScript / TypeScript projects at Shopify.
    jsondiffpatch - Diff & patch JavaScript objects.
    RVal - Minimalistic transparent reactive programming library.
    orbit-controls - Generic controls for orbiting a target in 3D.
    estree-walker - Traverse an ESTree-compliant AST.
    Jitsi Meet API library - Can use Jitsi Meet API to create Jitsi Meet video conferences with a custom GUI.
    isomer - Simple isometric graphics library for HTML5 canvas.
    Mordred - Source data from anywhere, for Next.js, Nuxt.js, Eleventy and many more.
    ASScroll - Hybrid smooth scroll setup that combines the performance gains of virtual scroll with the reliability of native scroll.
    Gallery - Light, responsive, and performant JavaScript gallery.
    Logux Server - Build own Logux server or make proxy between WebSocket and HTTP backend on any language.
    @expo/results - Efficient, standards-compliant library for representing results of successful or failed operations.
    Emojibase - Collection of lightweight, up-to-date, pre-generated, specification compliant, localized emoji JSON datasets, regex patterns, and more.
    serve-favicon - Node.js middleware for serving a favicon.
    download - Download and extract files.
    color2k - Color parsing and manipulation lib served in 2kB or less.
    Sandstorm - Open source platform for self-hosting web apps. (Code)
    transformation-matrix - JS isomorphic 2D affine transformations written in ES6 syntax.
    Muuri - JavaScript layout engine that allows you to build all kinds of layouts and make them responsive, sortable, filterable, draggable and/or animated.
    Split - Unopinionated utilities for resizeable split views.
    Parallax Engine - Reacts to the orientation of a smart device.
    fastq - Fast, in memory work queue.
    ac-colors - Reactive JavaScript color library that can freely convert color formats.
    sonic-boom - Extremely fast utf8 only stream implementation.
    Rough Notation - Small JavaScript library to create and animate annotations on a web page. (HN)
    SqueakJS - Squeak VM for the Web and Node.js. (Web)
    fit-textarea - Automatically expand a to fit its content, in a few bytes.
    NanoPop - Ultra Tiny, Opinionated Positioning Engine. (Web)
    Angelfire - Lets you quickly build right-click-enabled context menus and drop-down menus for any element on your webpage.
    csv-parser - Streaming csv parser inspired by binary-csv that aims to be faster than everyone else.
    updeep - Easily update nested frozen objects and arrays in a declarative and immutable manner.
    Hull.js - JavaScript library that builds concave hull by set of points.
    StegCloak - Hide secrets with invisible characters in plain text securely using passwords.
    p-min-delay - Delay a promise a minimum amount of time.
    match-when - Pattern matching for modern JavaScript.
    NumJs - Like NumPy, in JavaScript.
    spect - Reactive aspect-oriented web-framework.
    js-cid - CID implementation in JavaScript.
    js-ipld-block - Implementation of the Block data structure in JavaScript.
    wildcard-api - Functions as API.
    bpmn-js - BPMN 2.0 rendering toolkit and web modeler.
    fit-curve - JavaScript implementation of Philip J. Schneider's "Algorithm for Automatically Fitting Digitized Curves" from the book "Graphics Gems".
    clean-deep - Remove falsy, empty or nullable values from objects.
    regular-table - Regular library, for async and virtual data models.
    Stimulus - Modest JavaScript framework for the HTML you already have. (Web)
    bigpicture.js - Library that allows infinite panning and infinite zooming in HTML pages. (Web)
    Tragopan - Minimal dependency-free pan/zoom library. (HN)
    Deakins - Small Canvas 2D Camera.
    Turbolinks - Makes navigating your web application faster.
    CindyJS - Framework to create interactive (mathematical) content for the web. (Web) (HN)
    axios - Promise based HTTP client for the browser and nodeJS.
    astray - Walk an AST without being led astray.
    vnopts - Validate and normalize options.
    canvas confetti - On-demand confetti gun. (Docs)
    Graphlib - JavaScript library that provides data structures for undirected and directed multi-graphs along with algorithms that can be used with them.
    Dagre - JavaScript library that makes it easy to lay out directed graphs on the client-side.
    ecsy - Highly experimental Entity Component System framework implemented in javascript, aiming to be lightweight, easy to use and with good performance. (Docs)
    Object Visualizer - Visualize the JSON object to the DOM. (HN)
    Reach Schema - Functional schema-driven JavaScript object validation library.
    @cycle/callbags - Set of commonly used stream operators implemented as callbags with Typescript and ES modules.
    umbrella - Broadly scoped ecosystem & mono-repository of ~135 TypeScript projects for functional, data driven development.
    HTM - JSX-like syntax in plain JavaScript - no transpiler necessary.
    NativeScript - Framework for building native iOS and Android apps using JavaScript and CSS.
    schema-dts - JSON-LD TypeScript types for Schema.org vocabulary.
    flatpickr - JS date time picker.
    superjson - Safely serialize JavaScript expressions to a superset of JSON, which includes Dates, BigInts, and more.
    lazy-collections - Collection of fast and lazy operations.
    Perfect Arrows - Set of functions for drawing perfect arrows between points and shapes.
    Autocomplete.js - Fast and full-featured autocomplete library.
    urlcat - URL builder library for JavaScript. (Docs)
    Diagram Maker - Library to display an interactive editor for any graph-like data. (Docs) (HN)
    js-coroutines - 60fps with JavaScript Coroutines for idle processing and animation.
    Transducist - Ergonomic JavaScript/TypeScript transducers for beginners and experts.
    decimal.js - Arbitrary-precision Decimal type for JavaScript.
    Constant-Time JavaScript - Constant-time algorithms written in TypeScript.
    SheetJS - Spreadsheet Data Toolkit. Read, edit, and export spreadsheets. Works in web browsers and servers. (Web)
    Z - Pattern Matching for JavaScript. (Web)
    Graphology - Robust & multipurpose Graph object for JavaScript & TypeScript. (Docs)
    weak-napi - Make weak references to JavaScript Objects.
    nestie - Tiny (211B) and fast utility to expand a flattened object.
    Mock.js - Simulation data generator.
    Detect features - Detect and report browser and hardware features.
    JSZip - Create, read and edit .zip files with JavaScript.
    Classnames - Simple javascript utility for conditionally joining classNames together.
    cx - Concatenate your classes (with shortcuts).
    Defer - Tiny, type-safe, JavaScript-native defer implementation.
    freshie - Fresh take on building universal applications with support for pluggable frontends and backends.
    Luckysheet - Online spreadsheet like excel that is powerful, simple to configure, and completely open source. (Docs)
    noUiSlider - Lightweight JavaScript range slider.
    QRCode.js - Cross-browser QRCode generator for JavaScript. (Web)
    HyperScript - Create HyperText with JavaScript, on client or server.
    hyperscript-helpers - Terse syntax for hyperscript.
    EnlighterJS - Open source syntax highlighter written in pure javascript.
    eslisp - S-expression syntax for JavaScript, with Lisp-like hygienic macros. Minimal core, maximally customisable.
    Smoldash - Tiny lodash alternative built for the modern web.
    TypewriterJS - Simple yet powerful native javascript plugin for a cool typewriter effect.
    sse.js - Flexible Server Side Events source for JavaScript.
    Arkit - Visualises JavaScript, TypeScript and Flow codebases as meaningful and committable architecture diagrams. (Web)
    jsii - Allows code in any language to naturally interact with JavaScript classes.
    proxy-memoize - Intuitive magical memoization library with Proxy and WeakMap. (Tweet)
    CosmJS - Modular library consisting of multiple packages to power web experiences.
    Arwes - Futuristic Sci-Fi and Cyberpunk Graphical User Interface Framework for Web Apps. (Web)
    psl (Public Suffix List) - JavaScript domain name parser based on the Public Suffix List.
    invariant-packages - Packages for working with invariant(condition, message) assertions.
    evt - EventEmitter's typesafe replacement.
    webscan - Browser-based network scanner & local-IP detection.
    Pill - Add dynamic content loading to static sites with only 1 KiB of JS.
    fast-deep-equal - Fastest deep equal with ES6 Map, Set and Typed arrays support.
    preview-card - Customizable social media preview image.
    egjs-flicking - Easy-to-use and performant infinite carousel.
    SSE-Z - Slim, easy-to-use wrapper around EventSource.
    DefinitelyExported - Community-defined export maps for popular npm packages.
    jsdiff - JavaScript text differencing implementation.
    HyperFormula - Open source, spreadsheet-like calculation engine.
    fast-json-stringify - Significantly faster than JSON.stringify() for small payloads.
    isbot - JavaScript module that detects bots/crawlers/spiders via the user agent.
    valtio - Makes proxy-state simple.
    pica - High quality image resize in browser.
    Planton - Database-agnostic task scheduler.
    mime-types - JavaScript content-type utility.
    match-sorter - Simple, expected, and deterministic best-match sorting of an array in JavaScript.
    Fetch Event Source - Better API for making Event Source requests, with all the features of fetch().
    rafz - Coordinate requestAnimationFrame calls across your app and/or libraries.
    p-state - Inspect the state of a promise.
    v86 - x86 virtualization in JavaScript, running in your browser and NodeJS. (Web)
    Notyf - Minimalistic, responsive, vanilla JavaScript library to show toast notifications.
    Moveable - Draggable, Resizable, Scalable, Rotatable, Warpable, Pinchable, Groupable, Snappable.
    Execa - Process execution for humans.
    quick-lru - Simple “Least Recently Used” (LRU) cache.
    Deepdash - Tree traversal library written in Underscore/Lodash fashion. (Docs)
    Nano Delay - Tiny (25 bytes) Promise wrapper around setTimeout.
    ES Module Lexer - Low-overhead lexer dedicated to ES module parsing for fast analysis.
    keez - Frictionless hotkey handling for browsers.
    Zet - Set() as it should be.
    Ketting - Hypermedia client for JavaScript.
    yocto-queue - Tiny queue data structure.
    Nano JSX - Lightweight 1kB JSX library. (Web)
    Effects.js - Algebraic effects in javascript with scoped handlers, multishot delimited continuations, stack safety and do notation.
    flatten-js - JavaScript library for 2d geometry.
    is-retry-allowed - Check whether a request can be retried based on the error.code.
    backfill - JavaScript caching library for reducing build time.
    S-Libs - Collection of libraries for any of JS, RxJS, or Angular.
    watchpack - Wrapper library for directory and file watching.
    async-tag - Resolves template literals tag values before applying a generic tag.
    serialize-error - Serialize/deserialize an error into a plain object.
    errorstacks - Tiny library to parse error stack traces.
    Ape-ECS - Entity-Component-System library for JavaScript.
    rrule.js - JavaScript library for working with recurrence rules for calendar dates as defined in the iCalendar RFC and more. (Demo)
    scroller - Super-tiny library for your scrollytelling needs.
    Isomorphic DOMPurify - Makes it possible to use DOMPurify on server and client in the same way.
    navaid - Navigation aid (aka, router) for the browser in 850 bytes.
    glob-to-regexp - Convert a glob to a regular expression.
    cmap - Interactive visualization library for concept map.
    lezer-tree - Incremental GLR parser intended for use in an editor or similar system.
    matchit - Quickly parse & match URLs.
    acorn - Tiny, fast JavaScript parser, written completely in JavaScript.
    jsesc - Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.
    fastjson - Single-tweet, standards-compliant, high-performance JSON stack.
    grfn - Tiny (~400B) utility that executes a dependency graph of async functions as concurrently as possible.
    Nunjucks - Powerful templating engine with inheritance, asynchronous control, and more. (Web)
    Behavior3JS - Structures and algorithms that assist you in the task of creating intelligent agents for your game or application.
    qs - Querystring parser with nesting support.
    Exifer - Small module that read JPEG/TIFF meta-data.
    jsVideoUrlParser - JavaScript parser to extract information like provider, channel, id, start time from YouTube, Vimeo, Dailymotion, Twitch,... urls.
    TypeDI - Dependency injection tool for TypeScript and JavaScript.
    ibridge - Tiny, promise based, type safe library for easy, bidirectional and secure iframe communication.
    Monio - Async-capable IO monad for JS.
    Total.js - Excellent and stable server-side Node.js framework, client-side library for creating web applications with more than 230 UI components for free.
    memoize-one - Memoization library which only remembers the latest invocation.
    pjson - JSON stream parser for Go.
    InternMap - Map and Set with automatic key interning.
    geometry-processing-js - Fast, general-purpose framework for geometry processing on the web.
    Iterplus - Best of Rust/Haskell/Python iterators in JavaScript.
    SmolScroll - Tiny, flexible scroll listener with React support.
    Robot - Functional, immutable Finite State Machine library. (Docs)
    Enmap - Enhanced Map structure with additional utility methods.
    Honeycomb - Create hex grids easily, in node or the browser.
    chunkify - Split an iterable into evenly sized chunks.
    wobble - Tiny spring physics micro-library that models a damped harmonic oscillator.
    tmp-cache - Least-recently-used cache in 35 lines of code.
    static-eval - Evaluate statically-analyzable expressions.
    Sparse Octree - Sparse, pointer-based octree data structure.
    Signature Pad - JavaScript library for drawing smooth signatures.
    dom-to-image-retina - dom-to-image but generates high-resolution images.
    loglevel - Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods.
    Perfect Freehand - Draw perfect freehand lines.
    Alo - Full-fledged state management. (Docs)
    Form-Data - Library to create readable "multipart/form-data" streams. Can be used to submit forms and file uploads to other web applications.
    conf - Simple config handling for your app or module.
    gifenc - Fast and lightweight pure-JavaScript GIF encoder.
    tldts - Blazing Fast URL Parsing.
    Barba.js - Easy-to-use library that helps you create fluid and smooth transitions between your website's pages.
    Shuffle.js - Categorize, sort, and filter a responsive grid of items. (Web)
    stdlib - Standard library for JavaScript and Node.js. (Web)
    gensync - Allows users to use generators in order to write common functions that can be both sync or async.
    monet.js - Monadic types library for JavaScript.
    VivaGraph - Graph drawing library for JavaScript.
    Crochet - Small engine for story-driven games.
    diary - Zero-dependency, fast logging library for both Node and Browser.
    tinydate - Tiny reusable date formatter.
    FingerprintJS - Browser fingerprinting library with the highest accuracy and stability.
    Antiutils - TypeScript/JavaScript utilities for those who don't like utilities.

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